scale16.h File Reference

Musical note frequency lookup table (16-bit timer values) More...

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Macros
#define	A3   2272
#define	Ax3   2145
#define	B3   2024
#define	C3   3822
#define	Cx3   3607
#define	D3   3405
#define	Dx3   3214
#define	E3   3033
#define	F3   2863
#define	Fx3   2702
#define	G3   2551
#define	Gx3   2407
#define	A4   1136
#define	Ax4   1072
#define	B4   1012
#define	C4   1911
#define	Cx4   1803
#define	D4   1702
#define	Dx4   1607
#define	E4   1516
#define	F4   1431
#define	Fx4   1351
#define	G4   1275
#define	Gx4   1203
#define	A5   568
#define	Ax5   536
#define	B5   506
#define	C5   955
#define	Cx5   901
#define	D5   851
#define	Dx5   803
#define	E5   758
#define	F5   715
#define	Fx5   675
#define	G5   637
#define	Gx5   601
#define	C6   477
#define	Q   250
#define	H   500
#define	DO   C4
#define	RE   D4
#define	MI   E4
#define	FA   F4
#define	SOL   G4
#define	LA   A4
#define	SI   B4

Detailed Description

Musical note frequency lookup table (16-bit timer values)

Author

Roybel Carbonell Camejo

Date

2026-04-28

This file contains pre-calculated timer compare values (wavelengths) for generating musical notes with a 16-bit timer. Each value corresponds to a specific musical pitch.

Note

Values are calculated for 16-bit timer mode

Warning

These values assume specific timer prescaler settings

Calculation Method

The wavelength values represent the timer counter top value (OCR) needed to generate specific frequencies. Smaller values = higher pitch.

Usage

#include "scale16.h"
#include "organ.h"
 
// Play a C major scale
playNote(C4, 500);
playNote(D4, 500);
playNote(E4, 500);
playNote(F4, 500);
playNote(G4, 500);
playNote(A4, 500);
playNote(B4, 500);
playNote(C5, 500);

Definition in file scale16.h.